text: /*
   * Copyright 2016 Red Hat Inc.
   *
   * Permission is hereby granted, free of charge, to any person obtaining a
   * copy of this software and associated documentation files (the "Software"),
   * to deal in the Software without restriction, including without limitation
   * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   * and/or sell copies of the Software, and to permit persons to whom the
   * Software is furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in
   * all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
   * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
   * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
   * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
   * OTHER DEALINGS IN THE SOFTWARE.
   *
   * Authors: Ben Skeggs <bskeggs@redhat.com>
   */
  #include "dmacnv50.h"
  #include "rootnv50.h"
  
  #include <subdev/timer.h>
  
  static int
  gp102_disp_dmac_init(struct nv50_disp_dmac *chan)
  {
  	struct nv50_disp *disp = chan->base.root->disp;
  	struct nvkm_subdev *subdev = &disp->base.engine.subdev;
  	struct nvkm_device *device = subdev->device;
  	int ctrl = chan->base.chid.ctrl;
  	int user = chan->base.chid.user;
  
  	/* enable error reporting */
  	nvkm_mask(device, 0x6100a0, 0x00000001 << user, 0x00000001 << user);
  
  	/* initialise channel for dma command submission */
  	nvkm_wr32(device, 0x611494 + (ctrl * 0x0010), chan->push);
  	nvkm_wr32(device, 0x611498 + (ctrl * 0x0010), 0x00010000);
  	nvkm_wr32(device, 0x61149c + (ctrl * 0x0010), 0x00000001);
  	nvkm_mask(device, 0x610490 + (ctrl * 0x0010), 0x00000010, 0x00000010);
  	nvkm_wr32(device, 0x640000 + (ctrl * 0x1000), 0x00000000);
  	nvkm_wr32(device, 0x610490 + (ctrl * 0x0010), 0x00000013);
  
  	/* wait for it to go inactive */
  	if (nvkm_msec(device, 2000,
  		if (!(nvkm_rd32(device, 0x610490 + (ctrl * 0x10)) & 0x80000000))
  			break;
  	) < 0) {
  		nvkm_error(subdev, "ch %d init: %08x\n", user,
  			   nvkm_rd32(device, 0x610490 + (ctrl * 0x10)));
  		return -EBUSY;
  	}
  
  	return 0;
  }
  
  const struct nv50_disp_dmac_func
  gp102_disp_dmac_func = {
  	.init = gp102_disp_dmac_init,
  	.fini = gf119_disp_dmac_fini,
  	.bind = gf119_disp_dmac_bind,
  };
  